/*  
    This file is part of the Arctic Fox Code Tree (AFCT).
    Copyright 2002, Arctic Fox Computer Consulting Inc.

    AFCT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    AFCT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with AFCT; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

package org.afox.util.validators.string;

import org.afox.util.validators.*;

public class SequenceValidator extends Validator
{
	private String validSequence;

	public SequenceValidator(String sequence)
	{
		super();
		validSequence = sequence;
	}

	public SequenceValidator(String sequence, String errorMessage)
	{
		this(null, sequence, errorMessage);
	}

	public SequenceValidator(Validator previous, String sequence)
	{
		super(previous);
		validSequence = sequence;
	}

	public SequenceValidator(Validator previous, String sequence, String errorMessage)
	{
		super(previous, errorMessage);
		validSequence = sequence;
	}

	protected void validateImpl(Object theParameter) throws ValidateException
	{
		String target = (String) theParameter;
		int index = 0;
		for (int i = 0; i< validSequence.length(); i++)
		{
			try
			{
				index = target.indexOf(validSequence.charAt(i), index);
				if (index == (-1))
					throw new ValidateException(getErrorMessage("Valid sequence(" + 
										    validSequence +
										    ") not found."));
				index++;
			}
			catch (Exception x)
			{
				throw new ValidateException(getErrorMessage("Valid sequence(" + 
									    validSequence +
									    ") not found."));
			}
		}

	}

	protected String getDescription()
	{
		return "Valid strings must contain the following characters in the specified order: \"" + 
		       validSequence + "\".";
	}
}
